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Implement mbedtls_mpi_mod_sub()

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Signed-off-by: Tom Cosgrove <tom.cosgrove@arm.com>
This commit is contained in:
Tom Cosgrove
2022-12-01 14:27:37 +00:00
parent c3902ac661
commit 62b20488f1
5 changed files with 218 additions and 1 deletions
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30
library/bignum_mod.h
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@ -163,7 +163,35 @@ void mbedtls_mpi_mod_modulus_free( mbedtls_mpi_mod_modulus *m );
/* END MERGE SLOT 2 */
/* BEGIN MERGE SLOT 3 */
/**
* \brief Perform a fixed-size modular subtraction.
*
* Calculate `A - B modulo N`.
*
* \p A, \p B and \p X must all have the same number of limbs as \p N.
*
* \p X may be aliased to \p A or \p B, or even both, but may not overlap
* either otherwise.
*
* \note This function does not check that \p A or \p B are in canonical
* form (that is, are < \p N) - that will have been done by
* mbedtls_mpi_mod_residue_setup().
*
* \param[out] X The address of the result MPI. Must be initialized.
* Must have the same number of limbs as the modulus \p N.
* \param[in] A The address of the first MPI.
* \param[in] B The address of the second MPI.
* \param[in] N The address of the modulus. Used to perform a modulo
* operation on the result of the subtraction.
*
* \return \c 0 if successful.
* \return #MBEDTLS_ERR_MPI_BAD_INPUT_DATA if the given MPIs do not
* have the correct number of limbs.
*/
int mbedtls_mpi_mod_sub( mbedtls_mpi_mod_residue *X,
const mbedtls_mpi_mod_residue *A,
const mbedtls_mpi_mod_residue *B,
const mbedtls_mpi_mod_modulus *N );
/* END MERGE SLOT 3 */
/* BEGIN MERGE SLOT 4 */